So SLI will still have the memory limitatations like the traditional SLI then? Like, even if my GTX 580 has 3 GB, I will still be limited by the fact that the 570 only has 1.2 GB?

For instance, when I had my 570 SLI, I was not able to use Danoc's FXAA Injector, because each card only had 1.2 GB, and according to Afterburner, a lot more VRAM was required, so my SLI would never work and my FPS would almost immediately drop to around 30 FPS. Whenever I disabled the FXAA Injector, the SLI would work flawlessly.

First off, awesome work anatolymik! Second, don't try to mix match different shader model cards as you will most likely get erratic behavior (7900GT+9600GT just as a quick example). Say you have an 8800GT and don't want to bios mod it, you can add a 9800GT(x) to it.

If this proves that sli can be done with different cards ( i believe Nvidia state you can only sli matched cards) then in theory it enables nvidia owners to equal the versatility of AMD/ATI owners (subject to drivers)
It also Proves what a money grabbing bunch of bullshits Nvidia are.(forceing you to buy matched cards for sli)
How many Nvidia card owners would have bought a second card to upgrade to sli (hi-bred sli) in the same way many ati owners crossfired mixed cards such as 6950/6970.
How many card sales did Nvidia/partners lose to ATI due to this
ATI/AMD knew their cards could do this and publicy acknowlaged and supported this and so they " MUST HAVE GAINED SALES"

SHAME ON YOU NVIDIA YOU DESERVE TO LOSE SALES

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They have been losing sales thanks to contract with Intel being broken after Skt 775k, plus only being able to produce the NF 200 SLI bridge for both intel and AMD boards just to support SLI since Crossfire is all driver capability and auto supported by AMD and Intel chipsets.